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authorGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-01-23 13:27:02 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-01-25 14:56:32 +0300
commitd88c93f090f708c18195553b352b9f205e65418f (patch)
tree76d7cecb24578d4a38e2aca3f827c52501508afe /fs/debugfs/inode.c
parent3a34c986324c07dde32903f7bb262e6138e77c2a (diff)
downloadlinux-d88c93f090f708c18195553b352b9f205e65418f.tar.xz
debugfs: fix debugfs_rename parameter checking
debugfs_rename() needs to check that the dentries passed into it really are valid, as sometimes they are not (i.e. if the return value of another debugfs call is passed into this one.) So fix this up by properly checking if the two parent directories are errors (they are allowed to be NULL), and if the dentry to rename is not NULL or an error. Cc: stable <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/debugfs/inode.c')
-rw-r--r--fs/debugfs/inode.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c
index 13b01351dd1c..41ef452c1fcf 100644
--- a/fs/debugfs/inode.c
+++ b/fs/debugfs/inode.c
@@ -787,6 +787,13 @@ struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
struct dentry *dentry = NULL, *trap;
struct name_snapshot old_name;
+ if (IS_ERR(old_dir))
+ return old_dir;
+ if (IS_ERR(new_dir))
+ return new_dir;
+ if (IS_ERR_OR_NULL(old_dentry))
+ return old_dentry;
+
trap = lock_rename(new_dir, old_dir);
/* Source or destination directories don't exist? */
if (d_really_is_negative(old_dir) || d_really_is_negative(new_dir))